doc,test: add documentation and test on how to use addons in SEA #718

Job	Run time
Build slim tarball	1m 30s
x86_64-darwin: with shared libraries	31m 39s
x86_64-linux: with shared libraries	29m 24s
aarch64-darwin: with shared libraries	24m 26s
aarch64-linux: with shared libraries	24m 12s
	1h 51m 11s

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